https://wiki.ragnarevival.com/wiki/Hall_of_Abyss
After Wednesday WoE2, the Hall of abyss closes. People need to "invest" to open it again to the public. for each 5m zeny donation you get 1 Investment Ticket.
Alternatively you can wait for the Eden Daily Rewards: https://wiki.ragnarevival.com/wiki/Eden_Group_(Loki)
If you can't invest into HoA, it means it is full already and open for all. The only thing you then can do is either try one of the other HoA (as the one you tried) or wait till next week.